<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图去 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="addDialogVisible = true"
            >添加角色</el-button
          >
        </el-col>
      </el-row>

      <!-- 用户列表区域 -->
      <el-table :data="roleList" style="width: 100%" border stripe>
        <!-- 展开列列 -->
        <el-table-column label="#" type="expand">
          <template slot-scope="scope">
            <el-row
              v-for="(item1, i1) in scope.row.children"
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag type="primary"
                 closable
                      @close="removeRightById(scope.row, item1.id)"
                > {{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套和渲染二级权限 -->
                <el-row
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                  :class="[i2 === 0 ? '' : 'bdtop', 'center']"
                >
                  <el-col :span="6">
                    <el-tag type="success"
                     closable
                      @close="removeRightById(scope.row, item2.id)"
                    > {{ item2.authName }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                      >{{ item3.authName }}</el-tag
                    >
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column label="#" type="index"> </el-table-column>
        <el-table-column prop="roleName" label="角色名称"> </el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"> </el-table-column>
        <el-table-column label="操作" width="300">
          <template slot-scope="scope">
            <!-- 编辑按钮 -->
            <el-button
              type="primary"
              size="mini"
              icon="el-icon-edit"
              @click="showEditDialog(scope.row.id)"
              >编辑</el-button
            >
            <!-- 删除按钮 -->
            <el-button
              type="danger"
              size="mini"
              icon="el-icon-delete"
              @click="removeUserById(scope.row.id)"
              >删除</el-button
            >
            <!-- 分配权限按钮 -->
              <el-button
              type="warning"
               size="mini"
               icon="el-icon-setting"
               @click="showSetRightDialog(scope.row)"
                >分配权限</el-button
              >
          </template>
        </el-table-column>
      </el-table>
    </el-card>
     <!-- 分配权限的对话框 -->
    <el-dialog
      title="提示"
      :visible.sync="setRightDialogVisible"
      width="30%"
      @close="setRightDialogClosed"
  >
  <!-- 树形控件 -->
  <el-tree
    :data="rightsList"
    :props="treeProps"
    show-checkbox
    node-key="id"
    default-expand-all
    :default-checked-keys="defKeys"
    ref="treeRef"
  ></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 所用角色列表数据
      roleList: [],
      // 所有的权限列表数据
      rightsList: [],
      // 树形控件的绑定属性对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中的节点id值的数组
      defKeys: [],
      // 当前即将分配角色的id
      roleId: '',
      // 控制分配权限对话框的显示与影藏
      setRightDialogVisible: false
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表信息失败')
      }
      this.roleList = res.data
    },
    async removeRightById (role, rightId) {
    // 弹框提示改用户是否删除改权限
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(error => error)
      // 如果用户确认了删除，咋返回字符串confirm
      // 如果用户取消了删除，则返回字符串cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消了删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }
      this.$message.success('删除权限成功！')
      // 服务器返回的数据直接赋值给前台，防止刷新
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      // 获取分配角色的id
      this.roleId = role.id
      // 递归获取所有的三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
      // 获取所有权限的列表
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限失败')
      }
      this.rightsList = res.data
      console.log(res.data)
    },
    // 通过递归的形式 ，获取角色所有三级权限的id,并保存到defKeys中
    getLeafKeys (node, arr) {
      // 如果当前节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      // 递归遍历节点
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限的对话框的关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // 将所有的字符串用,连接起来
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idStr
      })
      if (res.meta.status !== 200) {
        return this.$message.error('角色授权失败！')
      }
      this.$message.success('分配角色成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>
<style scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  /* 纵向居中 */
  display: flex;
  align-items: center;
}
</style>
